(a) Define the following terms as used in experimental physics: (i) absolute…
PHYSICS · Subjective · CBSE · Physics · Units and Measurements · Units and Measurements
Problem
(a) Define the following terms as used in experimental physics:
(i) absolute uncertainty,
(ii) fractional (relative) uncertainty,
(iii) percentage uncertainty.
(b) A student measures the length of a metal rod as 25.0cm with an estimated uncertainty of ±0.1cm. Convert this uncertainty into fractional and percentage form.
(c) Another student determines the mass of a brass block as 75.0g with an uncertainty of ±0.5g. Without performing detailed calculations, state which of the two measurements—length of the rod or mass of the block—is more precise and justify your answer on the basis of percentage uncertainty.